*{
	/* 消除所有元素内外边距 */
	margin:0px;
	padding:0px;
}

#d{
		display: block;
		background-color: blue;
		height: 300px;
		width: auto;
		text-align: center;
		color: aliceblue;
	}

#b img{
	display: block;
	margin: 0 auto;

}

#g{
		text-align: center;
	}
	
	#b img{
		display: block;
		margin: 0 auto;
	
	}
	
	#g{
			text-align: center;
			margin: auto;
			width: 50%;
			border: 3px solid green;
			padding: 10px;
	
		}
		
		#nei{
				text-align: center;
				margin: auto;
				width: 50%;
				border: 3px solid green;
				padding: 10px;
		
			}
	#d a{
		text-decoration: none;
		color: darkorange;
	}
	#d ul{
		list-style-type:none;
		margin:1.25rem;
		padding:1.25rem;
	}
	#d li{
	display:inline;
	}